Repositories There are thousands of programs available to install on Ubuntu. These programs are stored in software archives (repositories) and are available for installation over the Internet. This makes it very easy to install new programs. It is also very secure, because each program you install is thoroughly tested and built specifically for Ubuntu.

The above source list are mainly for ubuntu edgy if you want to use these source list you need to edit the

/etc/apt/sources.list

sudo gedit /etc/apt/sources.list

add which source list you want to use save and exit the file.

Now you should see some of the source list is having the GPG key information for these keys you need to installed using the command menction against each source list just copy and paste the command in your terminal after finishing this gpg key infomation you need to update the source list using the following command

sudo apt-get update

Now you can install which package you want to install

Now we will see one example how to use these source lists

Example

If you want to install automatix package you need to use the following commands

add the following source list in /etc/apt/sources.list file save and exit

If you feel some source list is missing from this list you can always suggest that source list

Possible errors

W: GPG error: ftp://mirror.list.net stable Release:
The following signatures couldn’t be verified
because the public key is not available: NO_PUBKEY [key_id]
W: You may want to run apt-get update to correct these problems

You need to make sure that you have imported the corresponding GPG key information

If you want to generate generate an ubuntu sources.list for your preferred set of repositories from here

Can you post or get me the default sources.list for Edgy? This goes with my problems before and I thought using this would help. I have a backup of before i used this but it didnt help either and I can’t seem to find a default one.